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1da177e4 LT |
1 | /* |
2 | * Linux INET6 implementation | |
3 | * | |
4 | * Authors: | |
5 | * Pedro Roque <roque@di.fc.ul.pt> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | */ | |
12 | ||
13 | #ifndef _IP6_FIB_H | |
14 | #define _IP6_FIB_H | |
15 | ||
1da177e4 | 16 | #include <linux/ipv6_route.h> |
1da177e4 LT |
17 | #include <linux/rtnetlink.h> |
18 | #include <linux/spinlock.h> | |
86872cb5 TG |
19 | #include <net/dst.h> |
20 | #include <net/flow.h> | |
21 | #include <net/netlink.h> | |
b3419363 | 22 | #include <net/inetpeer.h> |
1da177e4 | 23 | |
a33bc5c1 NH |
24 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
25 | #define FIB6_TABLE_HASHSZ 256 | |
26 | #else | |
27 | #define FIB6_TABLE_HASHSZ 1 | |
28 | #endif | |
29 | ||
1da177e4 LT |
30 | struct rt6_info; |
31 | ||
fd2c3ef7 | 32 | struct fib6_config { |
86872cb5 TG |
33 | u32 fc_table; |
34 | u32 fc_metric; | |
35 | int fc_dst_len; | |
36 | int fc_src_len; | |
37 | int fc_ifindex; | |
38 | u32 fc_flags; | |
39 | u32 fc_protocol; | |
0ae81335 DA |
40 | u16 fc_type; /* only 8 bits are used */ |
41 | u16 fc_delete_all_nh : 1, | |
42 | __unused : 15; | |
86872cb5 TG |
43 | |
44 | struct in6_addr fc_dst; | |
45 | struct in6_addr fc_src; | |
c3968a85 | 46 | struct in6_addr fc_prefsrc; |
86872cb5 TG |
47 | struct in6_addr fc_gateway; |
48 | ||
49 | unsigned long fc_expires; | |
50 | struct nlattr *fc_mx; | |
51 | int fc_mx_len; | |
51ebd318 ND |
52 | int fc_mp_len; |
53 | struct nlattr *fc_mp; | |
86872cb5 TG |
54 | |
55 | struct nl_info fc_nlinfo; | |
19e42e45 RP |
56 | struct nlattr *fc_encap; |
57 | u16 fc_encap_type; | |
86872cb5 TG |
58 | }; |
59 | ||
fd2c3ef7 | 60 | struct fib6_node { |
1da177e4 LT |
61 | struct fib6_node *parent; |
62 | struct fib6_node *left; | |
63 | struct fib6_node *right; | |
8bce65b9 | 64 | #ifdef CONFIG_IPV6_SUBTREES |
1da177e4 | 65 | struct fib6_node *subtree; |
8bce65b9 | 66 | #endif |
1da177e4 LT |
67 | struct rt6_info *leaf; |
68 | ||
69 | __u16 fn_bit; /* bit key */ | |
70 | __u16 fn_flags; | |
42b18706 | 71 | int fn_sernum; |
f11e6659 | 72 | struct rt6_info *rr_ptr; |
c5cff856 | 73 | struct rcu_head rcu; |
1da177e4 LT |
74 | }; |
75 | ||
7fc33165 YH |
76 | #ifndef CONFIG_IPV6_SUBTREES |
77 | #define FIB6_SUBTREE(fn) NULL | |
78 | #else | |
79 | #define FIB6_SUBTREE(fn) ((fn)->subtree) | |
80 | #endif | |
1da177e4 | 81 | |
e715b6d3 FW |
82 | struct mx6_config { |
83 | const u32 *mx; | |
84 | DECLARE_BITMAP(mx_valid, RTAX_MAX); | |
85 | }; | |
86 | ||
1da177e4 LT |
87 | /* |
88 | * routing information | |
89 | * | |
90 | */ | |
91 | ||
fd2c3ef7 | 92 | struct rt6key { |
1da177e4 LT |
93 | struct in6_addr addr; |
94 | int plen; | |
95 | }; | |
96 | ||
c71099ac TG |
97 | struct fib6_table; |
98 | ||
fd2c3ef7 | 99 | struct rt6_info { |
d8d1f30b | 100 | struct dst_entry dst; |
1da177e4 | 101 | |
bd2c77a0 YH |
102 | /* |
103 | * Tail elements of dst_entry (__refcnt etc.) | |
104 | * and these elements (rarely used in hot path) are in | |
105 | * the same cache line. | |
106 | */ | |
107 | struct fib6_table *rt6i_table; | |
1da177e4 LT |
108 | struct fib6_node *rt6i_node; |
109 | ||
110 | struct in6_addr rt6i_gateway; | |
1da177e4 | 111 | |
51ebd318 ND |
112 | /* Multipath routes: |
113 | * siblings is a list of rt6_info that have the the same metric/weight, | |
114 | * destination, but not the same gateway. nsiblings is just a cache | |
115 | * to speed up lookup. | |
116 | */ | |
117 | struct list_head rt6i_siblings; | |
118 | unsigned int rt6i_nsiblings; | |
119 | ||
bd2c77a0 | 120 | atomic_t rt6i_ref; |
a47ed4cd | 121 | |
bd2c77a0 YH |
122 | /* These are in a separate cache line. */ |
123 | struct rt6key rt6i_dst ____cacheline_aligned_in_smp; | |
124 | u32 rt6i_flags; | |
125 | struct rt6key rt6i_src; | |
c3968a85 | 126 | struct rt6key rt6i_prefsrc; |
b4ce9277 | 127 | |
8d0b94af MKL |
128 | struct list_head rt6i_uncached; |
129 | struct uncached_list *rt6i_uncached_list; | |
130 | ||
bd2c77a0 | 131 | struct inet6_dev *rt6i_idev; |
d52d3997 | 132 | struct rt6_info * __percpu *rt6i_pcpu; |
b4ce9277 | 133 | |
705f1c86 | 134 | u32 rt6i_metric; |
4b32b5ad | 135 | u32 rt6i_pmtu; |
bd2c77a0 YH |
136 | /* more non-fragment space at head required */ |
137 | unsigned short rt6i_nfheader_len; | |
bd2c77a0 | 138 | u8 rt6i_protocol; |
1da177e4 LT |
139 | }; |
140 | ||
7a3025b1 YH |
141 | static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst) |
142 | { | |
143 | return ((struct rt6_info *)dst)->rt6i_idev; | |
144 | } | |
145 | ||
1716a961 G |
146 | static inline void rt6_clean_expires(struct rt6_info *rt) |
147 | { | |
1716a961 | 148 | rt->rt6i_flags &= ~RTF_EXPIRES; |
01ba16d6 | 149 | rt->dst.expires = 0; |
1716a961 G |
150 | } |
151 | ||
152 | static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires) | |
153 | { | |
1716a961 | 154 | rt->dst.expires = expires; |
ecd98837 | 155 | rt->rt6i_flags |= RTF_EXPIRES; |
1716a961 G |
156 | } |
157 | ||
ecd98837 | 158 | static inline void rt6_update_expires(struct rt6_info *rt0, int timeout) |
1716a961 | 159 | { |
ecd98837 YH |
160 | struct rt6_info *rt; |
161 | ||
162 | for (rt = rt0; rt && !(rt->rt6i_flags & RTF_EXPIRES); | |
163 | rt = (struct rt6_info *)rt->dst.from); | |
164 | if (rt && rt != rt0) | |
165 | rt0->dst.expires = rt->dst.expires; | |
166 | ||
167 | dst_set_expires(&rt0->dst, timeout); | |
168 | rt0->rt6i_flags |= RTF_EXPIRES; | |
1716a961 | 169 | } |
b197df4f | 170 | |
c5cff856 WW |
171 | /* Function to safely get fn->sernum for passed in rt |
172 | * and store result in passed in cookie. | |
173 | * Return true if we can get cookie safely | |
174 | * Return false if not | |
175 | */ | |
176 | static inline bool rt6_get_cookie_safe(const struct rt6_info *rt, | |
177 | u32 *cookie) | |
178 | { | |
179 | struct fib6_node *fn; | |
180 | bool status = false; | |
181 | ||
182 | rcu_read_lock(); | |
183 | fn = rcu_dereference(rt->rt6i_node); | |
184 | ||
185 | if (fn) { | |
186 | *cookie = fn->fn_sernum; | |
187 | status = true; | |
188 | } | |
189 | ||
190 | rcu_read_unlock(); | |
191 | return status; | |
192 | } | |
193 | ||
b197df4f MKL |
194 | static inline u32 rt6_get_cookie(const struct rt6_info *rt) |
195 | { | |
c5cff856 WW |
196 | u32 cookie = 0; |
197 | ||
02bcf4e0 | 198 | if (rt->rt6i_flags & RTF_PCPU || |
a4c2fd7f | 199 | (unlikely(!list_empty(&rt->rt6i_uncached)) && rt->dst.from)) |
3da59bd9 MKL |
200 | rt = (struct rt6_info *)(rt->dst.from); |
201 | ||
c5cff856 WW |
202 | rt6_get_cookie_safe(rt, &cookie); |
203 | ||
204 | return cookie; | |
b197df4f | 205 | } |
1716a961 | 206 | |
94e187c0 AW |
207 | static inline void ip6_rt_put(struct rt6_info *rt) |
208 | { | |
209 | /* dst_release() accepts a NULL parameter. | |
210 | * We rely on dst being first structure in struct rt6_info | |
211 | */ | |
212 | BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0); | |
213 | dst_release(&rt->dst); | |
214 | } | |
215 | ||
94b2cfe0 HFS |
216 | enum fib6_walk_state { |
217 | #ifdef CONFIG_IPV6_SUBTREES | |
218 | FWS_S, | |
219 | #endif | |
220 | FWS_L, | |
221 | FWS_R, | |
222 | FWS_C, | |
223 | FWS_U | |
224 | }; | |
225 | ||
226 | struct fib6_walker { | |
bbef49da | 227 | struct list_head lh; |
1da177e4 LT |
228 | struct fib6_node *root, *node; |
229 | struct rt6_info *leaf; | |
94b2cfe0 HFS |
230 | enum fib6_walk_state state; |
231 | bool prune; | |
2bec5a36 PM |
232 | unsigned int skip; |
233 | unsigned int count; | |
94b2cfe0 | 234 | int (*func)(struct fib6_walker *); |
1da177e4 LT |
235 | void *args; |
236 | }; | |
237 | ||
1da177e4 LT |
238 | struct rt6_statistics { |
239 | __u32 fib_nodes; | |
240 | __u32 fib_route_nodes; | |
241 | __u32 fib_rt_alloc; /* permanent routes */ | |
242 | __u32 fib_rt_entries; /* rt entries in table */ | |
243 | __u32 fib_rt_cache; /* cache routes */ | |
244 | __u32 fib_discarded_routes; | |
245 | }; | |
246 | ||
247 | #define RTN_TL_ROOT 0x0001 | |
248 | #define RTN_ROOT 0x0002 /* tree root node */ | |
249 | #define RTN_RTINFO 0x0004 /* node with valid routing info */ | |
250 | ||
251 | /* | |
252 | * priority levels (or metrics) | |
253 | * | |
254 | */ | |
255 | ||
1da177e4 | 256 | |
c71099ac TG |
257 | struct fib6_table { |
258 | struct hlist_node tb6_hlist; | |
259 | u32 tb6_id; | |
260 | rwlock_t tb6_lock; | |
261 | struct fib6_node tb6_root; | |
8e773277 | 262 | struct inet_peer_base tb6_peers; |
830218c1 DA |
263 | unsigned int flags; |
264 | #define RT6_TABLE_HAS_DFLT_ROUTER BIT(0) | |
c71099ac TG |
265 | }; |
266 | ||
267 | #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC | |
268 | #define RT6_TABLE_MAIN RT_TABLE_MAIN | |
c71099ac TG |
269 | #define RT6_TABLE_DFLT RT6_TABLE_MAIN |
270 | #define RT6_TABLE_INFO RT6_TABLE_MAIN | |
271 | #define RT6_TABLE_PREFIX RT6_TABLE_MAIN | |
272 | ||
273 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
274 | #define FIB6_TABLE_MIN 1 | |
275 | #define FIB6_TABLE_MAX RT_TABLE_MAX | |
101367c2 | 276 | #define RT6_TABLE_LOCAL RT_TABLE_LOCAL |
c71099ac TG |
277 | #else |
278 | #define FIB6_TABLE_MIN RT_TABLE_MAIN | |
279 | #define FIB6_TABLE_MAX FIB6_TABLE_MIN | |
101367c2 | 280 | #define RT6_TABLE_LOCAL RT6_TABLE_MAIN |
c71099ac TG |
281 | #endif |
282 | ||
8ed67789 DL |
283 | typedef struct rt6_info *(*pol_lookup_t)(struct net *, |
284 | struct fib6_table *, | |
4c9483b2 | 285 | struct flowi6 *, int); |
1da177e4 LT |
286 | |
287 | /* | |
288 | * exported functions | |
289 | */ | |
290 | ||
5c3a0fd7 JP |
291 | struct fib6_table *fib6_get_table(struct net *net, u32 id); |
292 | struct fib6_table *fib6_new_table(struct net *net, u32 id); | |
293 | struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6, | |
294 | int flags, pol_lookup_t lookup); | |
c71099ac | 295 | |
5c3a0fd7 JP |
296 | struct fib6_node *fib6_lookup(struct fib6_node *root, |
297 | const struct in6_addr *daddr, | |
298 | const struct in6_addr *saddr); | |
1da177e4 | 299 | |
5c3a0fd7 JP |
300 | struct fib6_node *fib6_locate(struct fib6_node *root, |
301 | const struct in6_addr *daddr, int dst_len, | |
302 | const struct in6_addr *saddr, int src_len); | |
1da177e4 | 303 | |
5c3a0fd7 | 304 | void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg), |
0c3584d5 | 305 | void *arg); |
c71099ac | 306 | |
e715b6d3 | 307 | int fib6_add(struct fib6_node *root, struct rt6_info *rt, |
333c4301 DA |
308 | struct nl_info *info, struct mx6_config *mxc, |
309 | struct netlink_ext_ack *extack); | |
5c3a0fd7 | 310 | int fib6_del(struct rt6_info *rt, struct nl_info *info); |
1da177e4 | 311 | |
37a1d361 RP |
312 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info, |
313 | unsigned int flags); | |
1da177e4 | 314 | |
5c3a0fd7 | 315 | void fib6_run_gc(unsigned long expires, struct net *net, bool force); |
1da177e4 | 316 | |
5c3a0fd7 | 317 | void fib6_gc_cleanup(void); |
1da177e4 | 318 | |
5c3a0fd7 | 319 | int fib6_init(void); |
101367c2 | 320 | |
8d2ca1d7 HFS |
321 | int ipv6_route_open(struct inode *inode, struct file *file); |
322 | ||
7e5449c2 | 323 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
5c3a0fd7 JP |
324 | int fib6_rules_init(void); |
325 | void fib6_rules_cleanup(void); | |
7e5449c2 DL |
326 | #else |
327 | static inline int fib6_rules_init(void) | |
328 | { | |
329 | return 0; | |
330 | } | |
331 | static inline void fib6_rules_cleanup(void) | |
332 | { | |
333 | return ; | |
334 | } | |
335 | #endif | |
1da177e4 | 336 | #endif |